Here is the full list of all 42 Ghost Song achievements.
Help your friends escape.
Complete the game on Original difficulty.
Defeat a Big Bot.
Obtain many modules.
Defeat Kellunhelk.
Defeat Old Singer.
Do a killer Painwheel juggle.
Visit The Cut Machine.
Find Charley.
Get to know the crew.
Receive a special gift from Molly.
Have a chat with Relic.
Once again, help to repair Gambler.
Fully repair Gambler.
Defeat Henriette again.
Defeat Elsom.
Get to know Saymund.
Continue to assist in the repair of Gambler.
Defeat Vek.
Obtain many weapons.
Spend time with Pasha.
Help Gili.
Bring a third part to Gambler.
Locate many Big Bots.
Push the large piece of junk down the hill.
Say goodbye to Mutt.
Show off with flowers.
Reach Mabec.
Obtain many Healing Cores.
Reach level 30.
Destroy many innocent creatures.
Help to repair Gambler again.
Heal yourself many times.
Help to repair Gambler.
Defeat Henriette...
Defeat many enemies.
Defeat Kika.
Defeat Dolly.
Arrive at the crash site.
Destroy many Roslock creatures in the pit.
Complete the game without dying.
Finish the game in under 3 hours.